Bluetooth: GAP: Update bonded device info immediately on NVRAM

As the new bt-if config updation have delay in writing items
to the NVRAM, some times there is a chance of not updating
incase of battery removal happens before the actual write onto
NVRAM.

As the bonded device info is important data to store, it will
update bonded info immediately onto NVRAM.

Change-Id: I9699c8225a77d9272420334b4c76b3c1df87e459